PROBLEM TO BE SOLVED: To easily perform air bleeding work performed when connecting a syringe of a syringe storing physiological saline or a syringe of a syringe storing contrast agent to a liquid injecting tube unit. A liquid injecting tube unit of the present invention is provided with a first tube into which a liquid is fed, and a first device provided on one end side in the longitudinal direction of the first tube and filled with the liquid. A first connecting part, a second connecting part provided on the other end side of the first tube in the longitudinal direction, a holding space capable of holding the liquid, and a discharge port communicating with the holding space. A first filter member that has a container that has and a first filter member that permeates the gas in the holding space and discharges the gas from the discharge port to make the liquid impermeable； and a first filter member that is connected to the second connection portion. 1. A cap member for bleeding air of No. 1 is provided. [Selection diagram]【課題】生理食塩水を貯留した注射器のシリンジや造影剤を貯留した注射器のシリンジを液体注入用チューブユニットに接続する作業の際に行うエア（空気）抜き作業を容易に行う。【解決手段】本発明の液体注入用チューブユニットは、液体が送り込まれる第１チューブと、前記第１チューブの長手方向の一端側に設けられ、前記液体が充填された第１器具に接続される第１接続部と、前記第１チューブの前記長手方向の他端側に設けられる第２接続部と、前記液体を保持することが可能な保持空間と、前記保持空間と連通する排出口とを有する収納体と、前記保持空間の気体を透過して該気体を前記排出口から排出し前記液体を不透過とする第１フィルタ部材と、を有し、前記第２接続部に接続される第１のエア抜き用キャップ部材と、を備えたことを特徴とする。【選択図】 図１
